/*
 *  matteblend - reads three frame-interlaced YUV4MPEG streams from stdin
 *               and blends the second over the first using the third's
 *               luminance channel as a matte
 *
 *  Copyright (C) 2001, pHilipp Zabel <pzabel@gmx.de>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "yuv4mpeg.h"

static void usage (progname) {

   fprintf (stderr, "usage:  %s -o <offset> [-f <framecount>]\n",progname);

}

int main (int argc, char *argv[]){
   int in_fd  = 0;         /* stdin */
   int out_fd = 1;         /* stdout */
   unsigned char *yuv[3];  /* output */
   y4m_stream_info_t streaminfo;
   y4m_frame_info_t frameinfo;
   int i;
   int w, h;
   int framenum;
   int offset=225;
   int totframes=0;

   if (argc < 3) {
      usage (argv[0]);
      exit (1);
   } else if (strcmp(argv[1],"-o")==0){
      offset=atoi(argv[2]);
   } 
   if ((argc==5) && (strcmp(argv[3],"-f")==0)) {
      totframes=atoi(argv[4]);
   }


   y4m_init_stream_info (&streaminfo);
   y4m_init_frame_info (&frameinfo);

   i = y4m_read_stream_header (in_fd, &streaminfo);
   if (i != Y4M_OK) {
      fprintf (stderr, "%s: input stream error - %s\n", 
	       argv[0], y4m_strerr(i));
      exit (1);
   }
   w = y4m_si_get_width(&streaminfo);
   h = y4m_si_get_height(&streaminfo);

   yuv[0] =  malloc (w * h);
   yuv[1] =  malloc (w * h / 4);
   yuv[2] =  malloc (w * h / 4);


   y4m_write_stream_header (out_fd, &streaminfo);
   framenum=0;
   while (1) {
      i = y4m_read_frame(in_fd, &streaminfo, &frameinfo, yuv);
      if ((i == Y4M_ERR_EOF)||(framenum-offset>=totframes &&(totframes>0))) {
	exit (0);
      }
      else if (i != Y4M_OK)
         exit (1);
      if(framenum>=offset)
        y4m_write_frame (out_fd, &streaminfo, &frameinfo, yuv);
      framenum++;
   }

}


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